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Oscillons and Dark Matter
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Oscillons and Dark Matter
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Oscillons are bound states sustained by self-interactions that appear in rather generic scalar models. They can be extremely long-lived and in the context of cosmology they have a built-in formation mechanism - parametric resonance instability. These features suggest that oscillons can affect the standard picture of scalar ultra-light dark matter (ULDM) models. We explore this idea along two directions. First, we investigate numerically oscillon lifetimes and their dependence on the shape of the potential. We find that scalar potentials that occur in well motivated axion-like models can lead to oscillons that live up to $10^8$ cycles or more. Second, we discuss the observational constraints on the ULDM models once the presence of oscillons is taken into account. For a wide range of axion masses, oscillons decay around or after matter-radiation equality and can thus act as early seeds for structure formation. We also discuss the possibility that oscillons survive up to today. In this case they can most easily play the role of dark matter.
Forward citations
Cited by 5 Pith papers
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Standard Model Effective Field Theory and Oscillons
The SMEFT operator O6=(Φ†Φ)³ extends SU(2) electroweak oscillon lifetimes by orders of magnitude at the physical mH/mW=1.556 for couplings below current bounds.
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Oscillon Floquet Modes and the Operators that Excite Them
Relativistic Floquet modes of the oscillon are expressed in elementary functions, and their quantum creation/annihilation operators are shown to satisfy the oscillator algebra at the computed order.
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Unified theory of oscillons and modes
Oscillons are reinterpreted as localized resonant modes from threshold or antibound modes via nonlinearity, with wobblerons as new kink-oscillon bound states.
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Multi-field oscillons/I-balls in the Friedberg-Lee-Sirlin model
Multi-field oscillons in the Friedberg-Lee-Sirlin model form bound states of two co-located oscillons that oscillate at their respective masses due to attractive interactions.
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Self-resonance preheating in deformed attractor models: oscillon formation and evolution
Deformed alpha-attractor T-models with a Gaussian feature near the minimum yield more smaller shorter-lived oscillons during self-resonance preheating, suppressing energy in oscillons and altering the high-frequency g...
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